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Stabilization of electron-hole pairs for more than 12 months at room temperature was achieved by using biphenyl molecules occluded in the Al-ZSM-5 zeolite type (see picture). The unpaired electrons are localized in the zeolite framework in the vicinity of the occluded biphenyl molecule. Results establish that the trapped electron-hole pair acquires a ferromagnetic ground state.
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Moissette et al. (2002) studied this question.
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